CN110168859A - Foreign matter detecting method and its device for wireless charging - Google Patents
Foreign matter detecting method and its device for wireless charging Download PDFInfo
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- CN110168859A CN110168859A CN201780082535.XA CN201780082535A CN110168859A CN 110168859 A CN110168859 A CN 110168859A CN 201780082535 A CN201780082535 A CN 201780082535A CN 110168859 A CN110168859 A CN 110168859A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H04B5/26—
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- H04B5/79—
Abstract
The present invention relates to foreign matter detecting method and its device and system.Embodiment according to the present invention, the foreign matter detecting method in wireless power transmitter may comprise steps of: if detecting the object in charged area, search has the present peak value frequency of maximum figure of merit value in available band；Receive from wireless power receiver includes the foreign bodies detection state data packets for referring to crest frequency；Foreign bodies detection reference frequency is determined based on reference crest frequency；And by being compared to present peak value frequency and foreign bodies detection reference frequency to determine whether there is foreign matter.Therefore, the advantage of the invention is that more efficient foreign matter can accurately be detected.
Description
Technical field
Embodiment is related to wireless power transmission technology, and is located at wireless power transmitter more particularly, to detection
Charged area in foreign matter method and device thereof.
Background technique
Recently, with the rapid development of information and communication technology (ICT), just developing based on information and communication technology (ICT) without no
In society.
For link information communication equipment whenever and wherever possible, should in all social facilities installation equipped with communication function
Computer chip sensor.It therefore, is a new challenge to these equipment or sensor power supply.In addition, with such as sound
The type of the mobile device of happy player (for example, as bluetooth cellular phone or iPod) and mobile phone increases sharply, and user needs
It takes more time and comes with energy for battery charging.As the method solved these problems, wireless power transmission technology is nearest
Cause concern.
Wireless power transmission or wireless energy transmission, which refer to, from sender wireless is sent electric energy using magnetic induction principle
To the technology of receiver.In 19th century, begin to use the motor or transformer using electromagnetic induction principle, and hereafter,
The electromagnetic wave such as high frequency waves, microwave and laser of radiation are attempted to transmit electric energy.The electric toothbrush that is commonly used and some electronic
Shaver is charged using electromagnetic induction principle.
Up to the present, wireless energy transfer approach can be roughly divided into the radio frequency of magnetic induction, EMR electromagnetic resonance and short-wave radio frequency
(RF) it transmits.
Magnetic induction method utilizes following phenomenon: when two coils are oriented located adjacent one another and then apply a current to
When one coil, generate magnetic flux to cause electromotive force in another coil, and this method in small device (for example, mobile
Phone) in positive ready commercial.Magnetic induction method can transmit up to several hundred kilowatts (kW) of electric power and have high efficiency.So
And since maximum transmission distance is 1 centimetre (cm) or smaller, thus the equipment to be charged should be positioned adjacent to charger or
Battery charger cradle.
EMR electromagnetic resonance method is using electric field or magnetic field rather than uses electromagnetic wave or electric current.EMR electromagnetic resonance method is little affected by
The influence of electromagnetic wave, therefore be advantageous in terms of safety for other electronic equipments and the mankind.Relatively, this method
It can be used in limited distance and space, and energy transmission efficiency is slightly lower.
Short-wave radio power transmission method (referred to as RF transmission method) is utilized can be direct in the form of radio wave
The fact that send and receive energy.The technology is the RF wireless power transmission method using RECTIFYING ANTENNA.RECTIFYING ANTENNA is antenna
With the combination of rectifier, refer to the element for RF electric power to be directly changed into DC electric power.That is, RF method is for inciting somebody to action
AC radio wave is converted into the technology of DC.Recently, as the efficiency of RF method improves, the business to RF method has energetically been carried out
The research of change.
Wireless power transmission technology can be not only used for mobile relevant industries, can be also used for such as IT, railway and household
The various industries of electric appliance.
If exist not in wireless charging area be wireless power receiver conductor, i.e. foreign matter (FO) then may be
Induction is from the received electromagnetic signal of wireless power transmitter in FO, to elevate the temperature.For example, FO may include coin, folder
Son, pin and ball pen.
If there are FO between wireless power receiver and wireless power transmitter, wireless charging efficiency may be significant
Reduce, and wireless power receiver and the temperature of wireless power transmitter may due to the environment temperature of FO raising and increase
Add.If not removing the FO in charged area, power wastage may occur, and may be damaged due to overheat wireless
Power transmitter and wireless power receiver.
Therefore, the accurate detection of the FO in charged area is just becoming the major issue in wireless charging technology.
In the related art, it discloses based on the threshold value determined according to the figure of merit value of reference figure of merit value and measurement
To determine whether there is the method for FO and be determined on wireless power transmission path based on wireless power path loss with the presence or absence of FO
Method.However, these methods have the FO accuracy in detection deteriorated according to the type of receiver and transmitter.
Summary of the invention
[technical problem]
Embodiment provides a kind of foreign matter detecting method and its device and system for wireless charging.
Embodiment provides one kind can be by by present peak value frequency and based on the foreign matter of reference crest frequency determination
Reference frequency (frequency boundary value) is compared to more accurately detect the foreign matter detecting method and its device of foreign matter.
Embodiment, which provides a kind of foreign matter detecting method and its device and system, the foreign matter detecting method, can pass through base
Foreign matter is determined whether there is in the statistical data of communication mistake counting and crest frequency variation more accurately to detect foreign matter.
The technical issues of being solved by embodiment is not limited to above-mentioned technical problem, and those skilled in the art from
It will be clear that other technologies problem not described herein in lower description.
[technical solution]
Embodiment provides a kind of foreign matter detecting method and its device.
Foreign matter detecting method according to the wireless power transmitter of embodiment may include: to work as to detect positioned at charging zone
When object in domain, search has the present peak value frequency of maximum figure of merit value in available band；It is received from wireless power
It includes the foreign bodies detection state data packets for referring to crest frequency that device, which receives,；Determine foreign bodies detection with reference to frequency based on reference crest frequency
Rate；And present peak value frequency is compared with foreign bodies detection reference frequency to determine whether there is foreign matter.
Here, the determination of foreign bodies detection reference frequency can include determining that tolerance and by reference to crest frequency and tolerance
Sum determine foreign bodies detection reference frequency.
For example, can be changed based on the crest frequency of the movement according to receiver in charged area to determine tolerance.
In another example, can be changed based on the crest frequency of the difference between the type according to wireless power transmitter
To determine tolerance.
In another example, can based on the peak-peak frequency of the movement according to receiver in charged area change and
Tolerance is determined according to the larger value of the peak-peak frequency of the difference between the type of wireless power transmitter variation.
In addition, can determine that there are foreign matters when present peak value frequency is greater than foreign bodies detection reference frequency.
Furthermore it is possible to which the echo after temporarily ceasing power transmission, into wireless power receiver for identification detects
Present peak value frequency is searched for before stage.
In addition, can have in the state that only wireless power receiver is located in charged area with reference to crest frequency can
With the maximum figure of merit value in frequency band.
In addition, foreign matter detecting method can also include: to terminate when confirmly detecting foreign matter to wireless power receiver
Power transmission and enter the choice phase.
In addition, foreign matter detecting method can also include exporting instruction after terminating power transmission to have detected that the pre- of foreign matter
Determine alert.
In addition, foreign bodies detection state data packets can also include pattern information, and can be based on pattern information identification packet
Include the reference crest frequency in foreign bodies detection state data packets.
Foreign matter detecting method according to the wireless power transmitter of another embodiment may include: that ought detect to be located to fill
When object in electric region, search has the present peak value frequency of maximum figure of merit value in available band；It is wrong to collect communication
The statistical data of miscount；When receiving the foreign bodies detection state data packets including reference crest frequency from wireless power receiver
When, foreign bodies detection reference frequency is determined based on reference crest frequency；Present peak value frequency and foreign bodies detection reference are compared
Frequency；When present peak value frequency be greater than foreign bodies detection reference frequency as comparative result when determine communication mistake count whether be more than
Predetermined communication mistake reference value；And determine that there are different when determining that communication mistake is counted more than predetermined communication mistake reference value
Object.
It is counted here it is possible to collect communication mistake in echo detection-phase or at least one of identification and configuration phase
Statistical data.
Furthermore it is possible to based in echo detection-phase to the electric power signal for being identified wireless power receiver by sending
The number of the reception failure of response signal and the reception mistake that data packet and configuration data packet are identified in identification and configuration phase
At least one of number lost counts to calculate communication mistake.
Here, the determination of foreign bodies detection reference frequency can include determining that tolerance and by reference to crest frequency and tolerance
Sum determine foreign bodies detection reference frequency.
For example, can be changed based on the crest frequency of the movement according to receiver in charged area to determine tolerance.
In another example, can be changed based on the crest frequency of the difference between the type according to wireless power transmitter
To determine tolerance.
In another example, can based on the peak-peak frequency of the movement according to receiver in charged area change and
Tolerance is determined according to the larger value of the peak-peak frequency of the difference between the type of wireless power transmitter variation.
It may include: search according to the detection device for foreign matter for detecting the foreign matter being located in charged area of embodiment
Unit is configured to when detecting the object in charged area, and search has maximum figure of merit value in available band
Present peak value frequency；Communication unit is configured to the foreign matter received from wireless power receiver include with reference to crest frequency
Detecting state data packet；Determination unit is configured to determine foreign bodies detection reference frequency based on reference to crest frequency；And inspection
Unit is surveyed, is configured to for present peak value frequency being compared with foreign bodies detection reference frequency to detect foreign matter.
Here, determination unit can determine foreign bodies detection reference frequency by reference to the sum of crest frequency and tolerance.
For example, can be changed based on the crest frequency of the movement according to receiver in charged area to determine tolerance.
In another example, can be changed based on the crest frequency of the difference between the type according to wireless power transmitter
To determine tolerance.
In another example, can based on the peak-peak frequency of the movement according to receiver in charged area change and
Tolerance is determined according to the larger value of the peak-peak frequency of the difference between the type of wireless power transmitter variation.
In addition, detection unit can determine that there are foreign matters when present peak value frequency is greater than foreign bodies detection reference frequency.
In addition, search unit can temporarily stop before entering the echo detection-phase of wireless power receiver for identification
Present peak value frequency is only searched for after power transmission.
In addition, with reference to crest frequency can have in the state that only wireless power receiver is located in charged area
Maximum figure of merit value in available band.
In addition, detection device for foreign matter can also include alarm unit, which is configured to detect when detection unit
Output instruction has detected that the predetermined alert of foreign matter when to foreign matter.
May include: according to the detection device for foreign matter for detecting the foreign matter being located in charged area of another embodiment
Search unit is configured to when detecting the object being located in charged area, and search has maximum product in available band
The present peak value frequency of prime factor value；Communication unit is configured to from wireless power receiver received data packet；Controller,
It is configured to monitor the reception state of data packet to collect the statistical data of communication mistake counting；And determination unit, quilt
It is configured to determine foreign matter based on reference crest frequency when receiving the foreign bodies detection state data packets including reference crest frequency
Detect reference frequency；Present peak value frequency is compared with foreign bodies detection reference frequency.When present peak value frequency is greater than foreign matter
It detects reference frequency and communication mistake counts when being more than predetermined communication mistake reference value, controller can determine that there are foreign matters.
It can be integrated with communication unit 1160 according to the control unit of embodiment or controller 1180.If wireless power
Transmitter and wireless power receiver execute in-band communications, then the electric current or electricity of coil unit 1130 can be used in controller 1180
Pressure is to demodulate signal.
Detection device for foreign matter according to embodiment includes: coil unit comprising inductor and resonant capacitor, and
Coil unit is configured to convert electrical current into magnetic force flux；Inverter, be configured to receive direct current (DC) electric power and by its
It is converted into exchange (AC) electric power and AC electric power is sent to coil unit；And controller, it is configured to control from inversion
Device output AC electric power frequency and signal is demodulated using the voltage of coil unit or electric current.Controller can be by
Be configured to: detection is located at the object in charged area to measure the crest frequency with maximum figure of merit value；From wireless power
It includes the foreign bodies detection state data packets for referring to crest frequency that receiver, which receives,；It determines for based on different with reference to peak value frequency detecting
The frequency of object；And crest frequency is compared with the frequency determined to determine whether there is foreign matter.
In addition, controller can determine the frequency for detecting foreign matter by reference to the sum of crest frequency and tolerance.
Controller can measure crest frequency before wireless power receiver receives echo detection signal.
It can correspond in the state that only wireless power receiver is located in charged area with reference to crest frequency available
Maximum figure of merit value in frequency band.
Another embodiment provides a kind of computer readable recording medium, and record has for executing foreign bodies detection side thereon
The program of any one in method.
The various aspects of present disclosure are only a part of the preferred embodiment of present disclosure, and this field is general
Logical technical staff can be designed that based on the detailed description to present disclosure and understand the technical characteristic based on present disclosure
Various embodiments.
[beneficial effect]
Effect according to the methods, devices and systems of embodiment is as follows.
Embodiment have the advantages that provide it is a kind of for wireless charging detection foreign matter method and device thereof and
System.
Embodiment, which has the advantages that, provides a kind of method and device thereof and system for detecting foreign matter, this method energy
It is enough more accurately to detect foreign matter.
Embodiment, which has the advantages that, provides a kind of wireless power transmitter, can make to cause due to foreign matter
Unnecessary power wastage and heating phenomena minimize.
Embodiment, which has the advantages that, provides a kind of foreign matter detecting method and its device, and this method is by will be current
Crest frequency can be more acurrate with being compared based on the determining foreign matter reference frequency (frequency boundary value) of reference crest frequency
Detect foreign matter in ground.
Embodiment, which has the advantages that, provides a kind of foreign matter detecting method and its device, and this method passes through based on logical
Believe that the statistical data of error count and crest frequency change to determine whether there is foreign matter, it is different so as to more accurately detect
Object.
Embodiment, which has the advantages that, accurately detects foreign matter, movement and hair but regardless of receiver in charged area
Send the type of device.
The effect of the disclosure is not limited to said effect, and those skilled in the art can be from below to present disclosure
Embodiment description in obtain other effects not described herein.That is, those skilled in the art can be from this public affairs
The embodiment for opening content obtains the unexpected effect of present disclosure.
Detailed description of the invention
Fig. 1 is the block diagram for showing the wireless charging system according to embodiment.
Fig. 2 is the state transition diagram for illustrating the wireless power transmit process according to embodiment.
Fig. 3 is the block diagram for showing the wireless power receiver according to embodiment.
Fig. 3 is the figure for showing the data packet format according to embodiment.
Fig. 4 is the figure for showing the data packet format according to embodiment.
Fig. 5 is the figure for showing the type of data packet according to embodiment.
Fig. 6 is the block diagram for showing the configuration of the detection device for foreign matter according to embodiment.
Fig. 7 is the block diagram for showing the configuration of the detection device for foreign matter according to another embodiment.
Fig. 8 is the state transition diagram for showing the foreign bodies detection process according to the detection device for foreign matter of embodiment.
Fig. 9 is the state transition diagram for showing the foreign bodies detection process according to the detection device for foreign matter of another embodiment.
Figure 10 is the view for showing the foreign bodies detection state data packets message according to embodiment.
Figure 11 is the flow chart of the foreign matter detecting method in the wireless power transmission device shown according to embodiment.
Figure 12 is the flow chart of the foreign matter detecting method in the wireless power transmission device shown according to another embodiment.
Figure 13 is the figure of merit value and peak according to the placement of foreign matter in wireless charging system shown according to embodiment
It is worth the experimental result table of the variation of frequency.
Figure 14 is the peak for showing the crest frequency according to every kind of receiver types of embodiment and the placement according to foreign matter
It is worth the experimental result table of the variation of frequency.
Figure 15 is the experiment for showing the variation of the figure of merit value and crest frequency according to the movement of wireless power receiver
As a result table.
Figure 16 be show according to the type of wireless power transmitter and foreign matter in the presence/absence of crest frequency variation
Experimental result.
Figure 17 be show when the resonance frequency according to the coil of the wireless power transmitter of embodiment be 100kHz and
The curve graph of the variation for the figure of merit value that wireless power receiver or foreign matter measure when being located in charged area.
Specific embodiment
[optimal mode]
Foreign matter detecting method according to the wireless power transmitter of embodiment may include: to work as to detect positioned at charging zone
When object in domain, search has the present peak value frequency of maximum figure of merit value in available band；It is received from wireless power
It includes the foreign bodies detection state data packets for referring to crest frequency that device, which receives,；Determine foreign bodies detection with reference to frequency based on reference crest frequency
Rate；And be compared present peak value frequency with foreign bodies detection reference frequency, to determine whether there is foreign matter.
[mode of the invention]
Hereinafter, the device according to embodiment and various methods are more fully described with reference to the accompanying drawings.In general, can be with
Element or component are referred to using such as suffix of " module " and " unit ".Such suffix used herein, which is intended merely to facilitate, to be retouched
State specification, suffix itself be not intended to have the function of any particular meaning or.
It should be understood that being formed in another element when each element is referred to as in the description below to embodiment
When "up" or "down", it can be formed with indirectly one or more directly "above" or "below" another element or between them
A intermediary element.In addition, it should be understood that being that can mean the upwardly direction of element and downward "above" or "below" element
Direction.
In the description of embodiment, for ease of description, have for sending wireless power in wireless charging system
The device of function can be with wireless power transmitter, wireless power transmission device, wireless power transmission device, wireless electric power
The exchanges such as transmitter, transmission end, transmitter, transmitting device, transmission equipment side, wireless power transmission device, wireless power conveyer make
With.With for from wireless power transmission device receive wireless power function device can with wireless power reception device,
Wireless power receiver, wireless power receiver, receives terminal, receiving side, reception device, connects wireless power reception device
Device etc. is received to be used interchangeably.
It may be configured to pad, bracket, access point (AP), small base station, platform, ceiling according to the transmitter of embodiment
The form of damascene structures or wall mounted versions.One transmitter can transmit electric power to multiple wireless power reception devices.For
This, transmitter may include at least one wireless power transmission device.Here, wireless power transmission device can be used based on electricity
The various wireless powers of magnetic induction method transmit standard, which is charged using following electromagnetic induction principle:
Magnetic field is generated in power transmission end-coil and electric current is induced in receiving end-coil by magnetic field.Here, wireless power passes
Sending device may include in the wireless charging alliance (WPC) or power supply things alliance (PMA) as wireless charging technical organization
The wireless charging technology of the electromagnetic induction method of definition.
In addition, may include at least one wireless power reception device according to the receiver of embodiment, and can be same
When from two or more transmitters receive wireless power.Here, wireless power reception device may include as wireless charging
The wireless charging of electromagnetic induction method defined in the wireless charging alliance (WPC) and power supply things alliance (PMA) of power technology tissue
Power technology.
Receiver according to the present embodiment can be used for compact electronic device such as mobile phone, smart phone, above-knee
Type computer, digital broadcast terminal, personal digital assistant (PDA), portable media player (PMP), navigation system, MP3
Player, electric toothbrush, electronic tag, lighting apparatus, remote controler, float for fishing and smartwatch wearable device) etc.,
But not limited to this, and can be used for including appointing for the wireless power reception device according to embodiment charged the battery
What device.
Fig. 1 is the block diagram for showing the wireless charging system according to embodiment.
Referring to Fig.1, wireless charging system generally comprises wireless power transmission end 10 for wirelessly sending electric power, is used for
Receive transmitted electric power wireless power receiving end 20 and for receive received electric power electronic device 30.
For example, wireless power transmission end 10 and wireless power receiving end 20 can execute in-band communications, wherein use with
Information is exchanged in the working frequency identical frequency band of wireless power transmission.
In in-band communications, when wireless power receiving end 20 receives the electric power signal sent by wireless power transmission end 10
When 41, wireless power receiving end 20 can be modulated the received electric power signal of institute and be sent to modulated signal 42 wirelessly
Power transmission end 10.
In another example, wireless power transmission end 10 and wireless power receiving end 20 can execute out-of-band communication, wherein
Information is exchanged using the frequency band different from the working frequency transmitted for wireless power.
For example, the information exchanged between wireless power transmission end 10 and wireless power receiving end 20 may include mutual
Status information and control information.Here, the shape by the description of embodiment, being exchanged between transmitting terminal and receiving end below
State information and control information will be apparent.
In-band communications and out-of-band communication can provide two-way communication, but embodiment is without being limited thereto.In another embodiment party
In formula, in-band communications and out-of-band communication can provide one-way communication or half-duplex operation.
For example, one-way communication can be, but not limited to mean the letter from wireless power receiving end 20 to wireless power transmission end 10
The transmission of breath or transmission from wireless power transmission end 10 to wireless power receiving end 20.
Half-duplex operation method is characterized in that, two-way between wireless power receiving end 20 and wireless power transmission end 10
Communication is enabled, but at specific time point, information can only be sent by an equipment.
According to the various status informations of the available electronic device 30 in wireless power receiving end 20 of embodiment.For example,
The status information of electronic device 30 can include but is not limited to current electricity usage information, current electricity usage information, for marking
Know information, CPU use information, battery charge state information, the cell output voltage/current information of application etc. executed, and
It and may include the information that can be obtained from electronic device 30 and be controlled for wireless power.
Particularly, can send instruction to wireless power receiving end 20 according to the wireless power transmission end 10 of embodiment is
The no predetermined packet data for supporting quick charge.When determining that fast charge mode is supported in wireless power transmission end 10, wireless power
Receiving end 20 can notify 30 wireless power transmission end 10 of electronic device to support fast charge mode.Electronic device 30 can pass through
Scheduled display device (for example, liquid crystal display) display instruction can be with the information of quick charge.
Fig. 2 is the state transition diagram for illustrating wireless power transmit process.
Referring to Fig. 2, the choice phase can be roughly divided into according to the power transmission from transmitter to receiver of embodiment
510, echo detection-phase 520, identification and configuration phase 530, negotiation phase 540, calibration phase 550, power transmission stage 560
And renegotiate the stage 570.
Choice phase 510 can when power transmission starts or power transmission keep while detect particular error or
Changed when particular event (e.g., including appended drawing reference S502, S504, S510 and S512).It is specific according to being described below
Mistake and particular event will be apparent.In addition, transmitter can monitor whether there is on interface surface in the choice phase 510
Object.When detecting that transmitter can be converted to echo detection-phase 520 there are when object on interface surface.In the choice phase
In 510, transmitter can send the simulation echo detection signal with very short pulse, and be based on transmission coil or primary
It whether there is object in effective coverage of the curent change of coil to detect interface surface.
If detecting object in the choice phase 510, wireless power transmitter can measure wireless power resonance electricity
The quality factor on road (for example, power transmission coil and/or resonant capacitor).
It in one embodiment, can be with measurement quality factor with determination when detecting object in the choice phase 510
Whether wireless power receiver is located in charged area together with foreign matter.
The coil being arranged in wireless power transmitter has in coil is likely due to environmental change and reduced inductance
And/or series resistance component, to reduce figure of merit value.It is determined whether there is to use measured figure of merit value
Foreign matter, wireless power transmitter can be received from wireless power receiver and previously surveyed in the state that foreign matter is not located at charged area
The reference figure of merit value of amount.
It can be compared received in negotiation phase 540 with reference to figure of merit value with the figure of merit value of measurement,
Determine whether that there are foreign matters.However, with the low wireless power receiver with reference to quality factor (for example,
According to the type of wireless power receiver, use and characteristic, specific wireless receiver may have low with reference to figure of merit value),
Since the difference between the figure of merit value measured when there are foreign matter and reference quality factor is small, so it difficult to determine whether depositing
In foreign matter.Therefore, it is necessary to further consider that other determine element or determine whether there is foreign matter using other methods.
In another embodiment, when detecting object in the choice phase 510, specific frequency area can be measured
Figure of merit value in (for example, working frequency region), to determine whether wireless power receiver is located at charging together with foreign matter
In region.The coil of wireless power transmitter can have inductance that can be reduced due to environmental change in coil and/or
Series resistance component, to change the resonance frequency of the coil of (displacement) wireless power transmitter.That is, as work frequency
The quality factor crest frequency of the frequency for measuring maximum figure of merit value in band can be shifted.
For example, since wireless power receiver includes the magnetic shield (shielding material) with high magnetic permeability, high magnetic
Conductance can increase the inductance value measured in the coil of wireless power transmitter.On the contrary, the foreign matter as metal material reduces
Inductance value.
Figure 18 is that show in the resonance frequency according to the coil of the wireless power transmitter of embodiment be the feelings of 100kHz
The curve graph of the variation of the figure of merit value measured under condition when wireless power receiver or foreign matter are located in charged area.
In general, passing through in the case where LC resonance circuitCalculate resonance frequency f_resonant.
It is humorous since L value increases when only wireless power receiver is located in charged area with reference to the left figure of Figure 18
Vibration frequency reduces to be moved to the left (displacement) on the frequency axis.
With reference to the right figure of Figure 18, when foreign matter is located in charged area, due to L value reduce, resonance frequency increase with
Move right (displacement) on the frequency axis.
In order to use the frequency for measuring maximum quality factor (that is, measured crest frequency) different to determine whether there is
Object, in the state that wireless power transmitter can be received in charged area from wireless power receiver without placing foreign matter in advance
The maximum quality factor frequency of the reference of measurement, that is, refer to crest frequency.It can be in negotiation phase 540 by the received reference peak of institute
Value frequency values are compared with measured peak frequency values, determine whether that there are foreign matters.
The foreign bodies detection compared by crest frequency the method for figure of merit value can be used together compared with.If with reference to
Poor very little between figure of merit value and measured figure of merit value, for example, can lead to if difference is equal to or less than 10%
It crosses and is compared to reference crest frequency and measured crest frequency to determine the presence of foreign matter.On the contrary, if quality factor
Between difference be more than 10%, then wireless power transmitter can immediately determine that there are foreign matters.
In another example, when as the result that will be referred to figure of merit value and be compared with measured figure of merit value
It determines there is no when foreign matter, reference crest frequency can be compared with measured crest frequency different to determine whether there is
Object.If being difficult to detect foreign matter using quality factor, wireless power receiver may include about foreign bodies detection status data
The information of reference crest frequency in packet and the data packet is sent to wireless power transmitter, and wireless power transmitter
It can further use about the information with reference to crest frequency and detect foreign matter, to improve foreign bodies detection ability.
In echo detection-phase 520, when sensing object, transmitter wakes up receiver, and sends for identification
Object detected whether be wireless power receiver digital echo detection signal.In echo detection-phase 520, when not having
When receiving response signal (for example, signal strength data packet) that digital echo detects from receiver, transmitter can turn again
Change to the choice phase 510.In addition, being terminated in echo detection-phase 520 when receiving the instruction power transmission from receiver
Signal (that is, charging termination data packet) when, transmitter can be converted to the choice phase 510.
If echo detection-phase 520 terminates, transmitter can be converted to identification and configuration phase 530, be connect with identification
It receives device and collects the configuration and status information of receiver.
In identification and configuration phase 530, when receiving unexpected data packet, when not receiving in the given time
When to desired data packet (time-out), power transmission contract (no electricity ought be established when there are data packet error of transmission or not
Power transmits contract) when, transmitter can be converted to the choice phase 510.
Transmitter can be determined based on the negotiation field value of the received configuration data packet in identification and configuration phase 530
Whether need to enter negotiation phase 540.
Determining that transmitter can be converted to negotiation phase 540 to execute scheduled FOD process when needing to negotiate.
On the contrary, determining that transmitter can be converted to the power transmission stage 560 immediately when not needing to negotiate.
In negotiation phase 540, transmitter can receive foreign bodies detection (FOD) status number including reference figure of merit value
According to packet.As an alternative, the FOD state data packets including reference peak frequency values be can receive.As an alternative, it can receive including reference
The state data packets of figure of merit value and reference peak frequency values.At this point, transmitter can be determined based on reference to figure of merit value
Quality factor threshold value for FO detection.
As an alternative, transmitter can determine the crest frequency threshold value for FO detection based on reference peak frequency values.It sends
The quality factor threshold value for FO detection can be used for device and currently the figure of merit value that measures (is surveyed before echo detection-phase
The figure of merit value of amount) come detect in charged area with the presence or absence of FO and according to FO detection result control power transmission.Example
Such as, when detecting FO, nack signal can be sent to wireless power receiver in response to FOD state data packets.Cause
This, can stop power transmission, but not limited to this.
Transmitter can be used for FO detection crest frequency threshold value and currently measure figure of merit value (echo inspection
Survey stage previously measured figure of merit value) come detect in charged area with the presence or absence of FO and according to FO detection result control
Power transmission.For example, nack signal can be sent to radio in response to FOD state data packets when detecting FO
Power receiver.Therefore, power transmission can be stopped, but not limited to this.
When detecting FO, transmitter can return to the choice phase 510 when receiver sends charging end message.Phase
Instead, when FO is not detected, transmitter can terminate transmission electric power and negotiate and pass through calibration phase 550 into the power transmission stage
560.Specifically, when FO is not detected, transmitter can measure the electric power damage of receiving end and transmission end in calibration phase 550
Consumption to determine the intensity of the received electric power in receiving end, and determines the intensity for the electric power that transmission end is sent.That is, calibrating
In stage 550, transmitter can predict electricity according to the difference between the transmission electric power of transmission end and the reception electric power of receiving end
Power loss.The power consumption of prediction can be used to calibrate the threshold value for FO detection in transmitter according to one embodiment.
In the power transmission stage 560, when receiving unexpected data packet, when being not received by the given time
When desired data packet (time-out), when the violation of power transmission contract occur or when charging termination, transmitter can change
To the choice phase 510.
In addition, being passed in the power transmission stage 560 if needing to reconfigure electric power according to the state change etc. of transmitter
When sending contract, transmitter can be converted to the stage of renegotiating 570.At this point, when renegotiating fair termination, transmitter can be with
Back to the power transmission stage 560.
Power transmission contract can be configured based on the status information of transmitters and receivers and characteristic information.For example, hair
Sending device status information may include the maximum amount of information about transmittable electric power and the maximum number about acceptable receiver
The information etc. of amount, receiver status information may include the information about required electric power.
Fig. 3 is the block diagram for showing the structure of the wireless power receiver according to embodiment.
With reference to Fig. 3, wireless power receiver 700 may include receiving coil 710, rectifier 720, DC to DC converter
730, load 740, sensing unit 750, communication unit 760 and master controller 770.Communication unit 760 may include demodulator 761
With modulator 762.
Although the wireless power receiver 700 shown in the example of fig. 3 is shown as through in-band communications and radio
Power transmitter 600 exchanges information, but this is only an embodiment, and can according to the communication unit of another embodiment 760
To provide short distance two-way communication by the frequency band different from the frequency band for sending wireless power signal.
Rectifier 720 can be sent to by the received AC electric power of receiving coil 710.Rectifier 720 can be by AC electricity
Power is converted to DC electric power and DC electric power is sent to DC to DC converter 730.DC to DC converter 730 can will be from rectifier
The intensity-conversion of the DC electric power of output is certain strength needed for load 740, and the electric power converted is sent to load 740.
Sensing unit 750 can measure the intensity of the DC electric power exported from rectifier 720, and mention to master controller 770
For the intensity.In addition, sensing unit 750 can be received according to wireless power measures the strong of the electric current for being applied to receiving coil 710
Degree, and measurement result is sent to master controller 770.In addition, sensing unit 750 can measure wireless power receiver 700
Internal temperature and the temperature value of measurement is provided to master controller 770.
For example, the intensity of the DC electric power exported from rectifier can be compared by master controller 770 with predetermined reference value,
And determine whether that overvoltage occurs.When determining generation overvoltage, the tentation data that instruction has occurred and that overvoltage can be generated
It wraps and sends it to modulator 762.The signal modulated by modulator 762 can be by receiving coil 710 or individual coil
(not shown) is sent to wireless power transmitter 600.
For example, master controller 770 can be generated FOD state data packets and be sent in the negotiation phase 540 of Fig. 2
To modulator 762.Here, the signal modulated by modulator 762 can be by receiving coil 710 or individual coil (not shown)
It is sent to wireless power transmitter 600.
If the intensity of the DC electric power exported from rectifier is equal to or more than predetermined reference value, master controller 770 can be with
It determines and receives sensing signal and performed control to when receiving sensing signal through modulator 762 to wireless power transmitter
600 send the signal strength indicator for corresponding to sensing signal.In another example, demodulator 761 can be to receiving coil 710
AC electric power signal between rectifier 720 is demodulated from the DC electric power signal that rectifier 720 exports, and identifies whether to connect
Sensing signal is received, and the result of identification is provided to master controller 700.At this point, master controller 770 can perform control to
Signal strength indicator corresponding with sensing signal is sent by modulator 762.
Fig. 4 is the view for showing the data packet format according to embodiment.
Referring to Fig. 4, the data packet for the information exchange between wireless power transmission end 10 and wireless power receiving end 20
Format 900 may include: for obtaining the synchronization for demodulating to corresponding data packet and identifying the accurate of corresponding data packet
910 field of lead code of start bit；It for identification include 920 field of head of the type of the message in corresponding data packet；
For sending 930 field of message of the content (or payload) of corresponding data packet；And corresponding data packet for identification
In whether occur mistake verification and 940 fields.
Data packet receiving end can be identified based on the value on head 920 including the message 930 in corresponding data packet
Size.
Furthermore it is possible to which each step for wireless power transmit process defines head 920, and can be in wireless power
The value on head 920 is defined as identical value in the different phase of transmit process.For example, referring to Fig. 6, it is noted that with return
The corresponding header value of end power transmission of the end power transmission and power transmission stage of sound detection-phase is 0x02.
Message 930 includes the data of corresponding data packet to be sent by transmission end.E.g., including in 930 field of message
Data can be report, request or response, but not limited to this.
It can also include for identification for sending the transmission of corresponding data packet according to the data packet 900 of another embodiment
In the transmission end identification information at end and the receiving end identification information for the receiving end for being used to receive corresponding data packet for identification extremely
It is one few.Transmission end identification information and receiving end identification may include IP address information, mac address information, product identification information
Deng.It however, present embodiment is without being limited thereto, and may include for distinguishing receiving end and transmission end in wireless charging system
Information.
If corresponding data is coated with multiple devices and receives, can also include according to the data packet 900 of another embodiment
Predetermined group of identification information of reception group for identification.
Fig. 5 is to show the data packet that wireless power transmitter is sent to according to the slave wireless power receiver of embodiment
The view of type.
Referring to Fig. 5, the data packet for being sent to wireless power transmitter from wireless power receiver may include: for sending
The signal strength data packet of the strength information of the echo detection signal sensed；For requesting the power transmission from transmitter
The power transmission type (terminating power transmission) of end；Electric control delayed data packet is used to transmit about receiving use
Until controlling the information of the time of practical electric power after the control error information packet of control；For transmitting the configuration of receiver
The configuration data packet of information；Identification data packet and extension identification data packet for transmitter-receiver identification information；For sending
The general request data packet of general request message；For sending the specific request data package of specific request message；It is used for sending
In the reference figure of merit value of FO detection and/or with reference to the FOD state data packets of peak frequency values；It is sent out for controlling by transmitter
The control error information packet of the electric power sent；Data packet is renegotiated for start to renegotiate；Electric power for transmitting and receiving
Strength information 24 bit reception electric power data packets；And the charged state of the present charge state information for sending load
Data packet.
Frequency band identical with for sending the frequency band of wireless power can be used to send using in-band communications from radio
Power receiver is sent to the data packet of wireless power transmitter.
Referring to Fig. 6, wireless power transmitter 1100 may include power supply unit 1101, DC to DC converter 1110, inversion
Device 1120, resonance circuit or coil unit 1130, measuring unit 1140, communication unit 1160, alarm unit 1175 and control
Unit or controller 1180.
Wireless power transmitter 1100 according to the present embodiment may be mounted at for wireless power reception device or nothing
In the measuring device of the certification of line electric power sending device.
Resonance circuit 1130 may include resonant capacitor 1131 and inductor (or transmission coil) 1132, and electric current is turned
It is changed to magnetic force flux.
Communication unit 1160 may include at least one of demodulator 1161 and modulator 1162.
Controller 1180 can execute in-band communications or out-of-band communication by communication unit 1160 and wireless power receiver.
Power supply unit 1101 can be sent to DC extremely by external power terminal or battery receptacle DC electric power, and by DC electric power
DC converter 1110.Here, battery may be mounted in wireless power transmitter 110, and can be electrically charged, but be only real
Apply mode.Battery can be connected to the power supply unit of wireless power transmitter 1100 in the form of boosting battery or external cell
1101 predetermined cable.
DC to DC converter 1110 can will be from the received DC electric power of power supply unit 1101 under the control of controller 1180
Intensity-conversion at specific DC electric power intensity.For example, DC may include that can adjust voltage strength to DC converter 1110
Variable voltage generator, but not limited to this.
Converted DC electric power can be converted into AC electric power by inverter 1120.Inverter 1120 can will be opened by multiple
The control of pass and the DC electric power signal inputted is converted into AC electric power signal, and export AC electric power signal.
For example, inverter 1120 may include full-bridge circuit.However, present embodiment is without being limited thereto, and inverter can
To include half-bridge circuit.
In another example, inverter 1120 may include half-bridge circuit and full-bridge circuit.In this case, controller
1180 can dynamically determine that inverter 1120 is operated as half-bridge operation or as full-bridge.
Wireless power transmission device according to one embodiment can the electric power according to needed for wireless power reception device
Intensity adaptively control the bridge mode of inverter 1120.
Here, bridge mode may include half-bridge mode and full-bridge mode.
For example, if the low-power of wireless power reception device request 5W, controller 1180 can execute control so that
Inverter 1120 is driven with half-bridge mode.
Relatively, if the high power of wireless power reception device request 15W, controller 1180, which can execute control, to be made
Inverter is obtained to drive with full-bridge mode.
In another example, wireless power transmission device can according to the thermal adaptability of sensing determine bridge mode,
And inverter 1120 is driven with determining bridge mode.
For example, if the temperature of wireless power transmission device is more than in the case where sending wireless power using half-bridge mode
Predetermined reference value, then controller 1180, which can perform control to, deactivates half-bridge mode and activates full-bridge mode.That is, nothing
Line power transmitter 1100 can increase voltage by full-bridge circuit in the case where transmission has the electric power of same intensity and drop
The low current strength flowed in resonance circuit 1130, so that the internal temperature of wireless power transmission device is maintained at reference value
Or it is smaller.In general, the amount of the heat generated in the electronic component of installation in an electronic may compare current strength and be applied to
The voltage strength of electronic component is more sensitive.
In addition, DC electric power not only can be converted into AC electric power by inverter 1120, but also change the intensity of AC electric power.
For example, inverter 1120 can be handed under the control of controller 1180 by adjusting the reference for generating AC electric power
The frequency of galvanic electricity signal exports the intensity of AC electric power to adjust.For this purpose, inverter 1120 may include for generating with specific
The frequency oscillator of the reference ac signal of frequency.However, this is only example, and frequency oscillator can be independently of inversion
Device 1120 is installed and is mounted at the side of wireless power transmitter 1100.
In another example, wireless power transmitter 1100 can also include being arranged in inverter 1120 for controlling
The gate drivers (not shown) of switch.In this case, gate drivers can receive at least one from controller 1180
Pulse width modulating signal, and according to the switch of the pulse width modulating signal control inverter 1120 received.Controller
1180 can control the duty ratio (that is, duty ratio) and phase of pulse width modulating signal, to control the output of inverter 1120
The intensity of electric power.Controller 1180 can be based on adaptively controlling pulse from the received feedback signal of wireless power reception device
The duty ratio and phase of bandwidth modulation signals.
Measuring unit 1140 can according to controller 1180 control 1131 both ends of signal measurement resonant capacitor voltage,
At least one of electric current and impedance, to calculate the figure of merit value of resonance circuit 1130.At this point it is possible to by quality calculated
Factor value is sent to controller 1180, and controller 1180 can will be stored from the received figure of merit value of measuring unit 1140
In scheduled record area.
As an alternative, measuring unit 1140 can measure the voltage at 1131 both ends of resonant capacitor to measure resonant frequency value.
At this point, resonance frequency can indicate the frequency with maximum figure of merit value.At this point, resonant frequency value calculated can be sent out
Send to controller 1180, and controller 1180 can will be stored in from the received resonant frequency value of measuring unit 1140 it is scheduled
In record area.
In addition, measuring unit 1140 can be under the control of controller 1180 in specific frequency unit measurement available band
Figure of merit value, and measurement result is sent to controller 1180.
In addition, measuring unit 1140 can detecte the electric current I_coil flowed in coil unit and be applied to coil unit
Voltage, and electric current and voltage are provided to controller 1180.At this point, controller 1180 can be based on connecing from measuring unit 1140
The voltage or electric current of receipts demodulate signal.
For example, when detecting object in the choice phase, controller 1180 can temporarily cease power transmission and
Request the figure of merit value at multiple frequencies in working band from measuring unit 1140 before into echo detection-phase
Measurement.Controller 1180 can identify frequency corresponding with the maximum value in the figure of merit value measured, and by the frequency of identification
It is determined as present peak value frequency.
When receiving FOD state data packets from demodulator 1161 in negotiation phase, controller 1180 can be based on FOD
The information determination for including in state data packets is used to determine whether that there are the threshold value of foreign matter (or threshold ranges).Here, by with
The method of the description of lower attached drawing, threshold value (or threshold range) will be apparent.
FOD state data packets may include corresponding with wireless power receiver with reference to figure of merit value Q_reference
And/or with reference at least one of crest frequency F_reference_peak value.
Controller 1180 can determine foreign bodies detection reference frequency with reference to peak frequency values based on received.
Identified foreign bodies detection reference frequency can be compared to detect by controller 1180 with present peak value frequency
Foreign matter.
For example, controller 1180, which can determine, to be filled when present peak value frequency values are greater than foreign bodies detection reference frequency value
There are foreign matters in electric region.
It can be corrected being converted in the case where considering the error range or manufacturing characteristics of wireless power transmitter
The frequency values for executing above embodiment after value compare.
As shown in the experimental result of the following drawings, the peak with maximum figure of merit value when foreign matter is located in charged area
It is worth the crest frequency that frequency is greater than before placing foreign matter.
In addition, as shown in the experimental result of the following drawings, it can be seen that crest frequency can be according in charged area
Wireless power receiver position and change.
Therefore, when being confirmed as foreign bodies detection reference frequency with reference to crest frequency from wireless power receiver is received,
Detection device for foreign matter 1200 may will be mistakenly considered according to the variation of the crest frequency of receiver change in location due to being located at charged area
Foreign matter caused by crest frequency change.In order to solve this problem, can by by with the peak value frequency mobile according to receiver
Rate changes corresponding predetermined tolerance value and is applied to be determined with reference to peak frequency values according to the foreign bodies detection of embodiment with reference to frequency
Rate.It can be by by 5kHz and reference peak with reference to peak value set of frequency by foreign bodies detection for example, if tolerance is 5kHz
It is worth the value that frequency is added and obtains.
Therefore, controller 1180 can determine that present peak value frequency values are greater than and also be less than foreign bodies detection reference frequency
Value, and determine present peak value frequency whether due to receiver movement and from reference peak value frequency shift.
When controller 1180 is determined there are when foreign matter, wireless power transmitter can be in response to FOD state data packets to nothing
Line power receiver sends nack signal.Therefore, charging end message can be sent to wirelessly by wireless power receiver
Power transmitter.When receiving charging end message, wireless power transmitter can stop power transmission.As additional reality
Mode is applied, can control the predetermined alert that the output instruction of alarm unit 1175 has detected that foreign matter.For example, alarm unit
1175 may include buzzer, LED light, vibrating elements and liquid crystal display, but not limited to this.It can be used and be capable of informing a user that
Any alarm unit of foreign bodies detection.
Including in FOD state data packets reference figure of merit value or can be by being used specified with reference to peak frequency values
It is next true in advance in being tested on the specific wireless electric power transmitter (or measuring device) that standard performance is tested and receiver authenticates
It is fixed, and can be arranged in wireless power receiver.
For example, can will be charged area (for example, the charging panel in wireless power transmitter or measuring device be arranged in)
In multiple specified locations correspond to wireless power receiver measurement figure of merit value in minimum value be determined as reference material
Prime factor value.
For example, can will be charged area (for example, the charging panel in wireless power transmitter or measuring device be arranged in)
In multiple specified locations correspond to wireless power receiver measurement peak frequency values in peak be determined as reference material
Prime factor value.
When detecting foreign matter in negotiation phase, controller 1180 can be in response to FOD state data packets to radio
Power receiver sends nack signal.Therefore, charging end message can be sent to wireless power by wireless power receiver
Transmitter.When receiving charging end message, wireless power transmitter can stop power transmission and return to the choice phase.
As additional embodiment, controller 1180 can execute foreign bodies detection after returning to the choice phase again
Process and determine whether to remove the foreign matter detected from charged area.When determining that foreign matter has been removed, controller
1180 can enter the power transmission stage and execute the charging of wireless power reception device.
In addition, controller 1180 can monitor whether normally receive response signal in echo detection-phase (for example, letter
Number intensity data packet).For example, controller 1180, which can be calculated, does not normally receive signal after digital echo detection transmission
The number of intensity data packet.
In addition, controller 1180 can monitor whether normally receive identification and configuration data in identification and configuration phase
Packet.For example, controller 1180 can calculate the quantity of identification and the reception failure of configuration data packet.
Hereinafter, description is determined to the example of the reception failure of identification and configuration data packet.
For example, when not normally receiving knowledge in predetermined first time after normally receiving signal strength data packet
When other data packet, controller 1180 can determine that identification and the reception of configuration data packet have failed.
In another example, make a reservation in the second time when after normally receiving signal strength data packet without successively
When receiving a series of all identification data packets, controller 1180 can determine that identification and the reception of configuration data packet have been lost
It loses.
Hereinafter, for ease of description, echo detection-phase and/or identification are received with the data packet in configuration phase loses
The quantity lost is referred to as communication mistake counting.
For example, being more than scheduled when present peak value frequency values are greater than foreign bodies detection reference frequency value and communication mistake counting
When communication mistake reference value, controller 1180 can determine that there are foreign matters on wireless power transmission path.
On the contrary, when present peak value frequency values are greater than foreign bodies detection reference frequency value but communication mistake counting equal to or less than pre-
When fixed communication mistake reference value, controller 1180 can determine that there is no foreign matters on wireless power transmission path.
Fig. 7 is the block diagram for showing the structure of the detection device for foreign matter according to another embodiment.
Referring to Fig. 7, detection device for foreign matter 1200 may include measuring unit 1210, search unit 1220, communication unit
1230, determination unit 1240, detection unit 1250, alarm unit 1260, storage unit 1270, transmission unit 1280 and controller
1290.It it should be noted that the component of detection device for foreign matter 1200 is not enforceable, and may include more or fewer portions
Part.
Transmission unit 1280 may include DC to DC converter, inverter and for the resonance circuit of wireless power transmission.
When detecting the object in charged area in the choice phase, measuring unit 1210 can temporarily cease electricity
Power transmission and the measurement quality factor value at scheduled reference operation frequency.Here it is possible to available band (or work frequency
Band) in determine multiple frequencies at measurement quality factor value.For example, available band can be 88kHz to 151kHz, but it is only
Embodiment, and can be according to the purpose of design of those skilled in the art and the wireless power transmission technology (or standard) of application
And change.
Search unit 1220 can search for the frequency with maximum figure of merit value based on the measurement result of measuring unit 1210
Rate, that is, present peak value frequency.The present peak value frequency that search unit 1220 is searched for can store in the predetermined of storage unit 1270
In record area.
Experimental result with reference to the following drawings, when foreign matter is located in charged area together with wireless power receiver, with
The situation that only wireless power receiver is located in charged area is compared, and has the crest frequency of maximum figure of merit value can be into one
Step increases.
Communication unit 1230 can demodulate wireless signal and be obtained and as shown in Figure 5 be sent out by wireless power receiver
The various data packets sent.For example, communication unit 1230 can obtain signal strength data packet in echo detection-phase.In addition,
Communication unit 1230 can obtain identification data packet and configuration data packet in identification and configuration phase.In addition, communication unit
1230 can obtain foreign bodies detection (FOD) state data packets in negotiation phase.In addition, communication unit 1230 can be in power transmission
Stage receives the control wrong data packet for Electric control, reception electric power data packet etc..
For example, foreign bodies detection state data packets may include with reference to figure of merit value Q_reference or with reference to peak value frequency
At least one of rate value F_reference_peak.
By the description of Figure 10, the structure of foreign bodies detection state data packets be will be apparent.
Determination unit 1240 can be determined based on including the reference peak frequency values in foreign bodies detection state data packets
Foreign bodies detection reference frequency.
For example, determination unit 1240 can be by that will be made a reservation for based on the peak-peak frequency shift moved according to receiver
The first tolerance and with reference to peak frequency values phase Calais calculate foreign bodies detection reference frequency.
In another example, determination unit 1240 can be by will be based on according to the difference between wireless power sender type
Scheduled second tolerance of different peak-peak frequency variation calculates foreign bodies detection reference with reference to peak frequency values phase Calais
Frequency.
In another example, the larger value of the first tolerance and the second tolerance can be determined as holding by determination unit 1240
Difference, and determining tolerance is added with reference to peak frequency values to calculate foreign bodies detection reference frequency.
Identified foreign bodies detection reference frequency can be compared by detection unit 1250 with present peak value frequency, with inspection
Survey the foreign matter being placed on wireless power transmission path.
For example, when present peak value frequency is greater than foreign bodies detection reference frequency (or the boundary value calculated using reference frequency)
When, detection unit 1250 can determine that there are foreign matters in charged area.
As shown in the experimental result of Figure 13, when foreign matter is located in charged area, there is the peak value of maximum figure of merit value
The value of frequency becomes larger than the crest frequency before placing foreign matter.
In addition, as shown in the experimental result of Figure 13, it can be seen that crest frequency is according to the radio being located in charged area
The position of power receiver and change.
Therefore, when being confirmed as foreign bodies detection reference frequency with reference to crest frequency from wireless power receiver is received,
Detection device for foreign matter 1200 may will be mistakenly considered according to the variation of the crest frequency of receiver change in location due to being placed on charged area
Foreign matter caused by crest frequency change.In order to solve this problem, it may be considered that with reference to peak frequency values and correspond to basis
The predetermined tolerance value of the mobile crest frequency variation of receiver determines the foreign bodies detection reference frequency according to embodiment.Example
It such as, can be with reference to the sum of crest frequency and 5kHz with reference to peak value set of frequency by foreign bodies detection if tolerance is 5kHz.
However, according to experimental result described below, it can be seen that according to the increment for the peak frequency values that foreign matter is placed
(or increasing ratio) is greater than the increment (or deviation) of the crest frequency of the movement according to receiver in charged area.Therefore, root
It can determine that present peak value frequency values are greater than according to the detection unit 1250 of an embodiment and also be less than foreign bodies detection reference
Frequency values, and accurately determining present peak value frequency is since foreign matter is from the frequency shift of reference peak value or due to receiver
It moves from reference peak value frequency shift.
In addition, according to experimental result described below, it can be seen that according to the increment for the peak frequency values that foreign matter is placed
(or increasing ratio) is greater than the increment (or deviation) of the crest frequency according to the difference between wireless power sender type.Cause
This, detection unit 1250 according to one embodiment can determine that present peak value frequency values are greater than and also be less than foreign bodies detection
Reference frequency value, and accurately determining present peak value frequency is since foreign matter is from the frequency shift of reference peak value or due to sending
Difference between device is from reference peak value frequency shift.
When determine on wireless power transmission path there are when foreign matter, detection unit 1250 can stop power transmission, and
And control the predetermined alert that the output instruction of alarm unit 1260 has been detected by foreign matter.For example, alarm unit 1160 can be with
Including buzzer, LED light, vibrating elements and liquid crystal display, but not limited to this.It can be used and be capable of informing a user that foreign bodies detection
Any alarm unit.
It can be by specifying for standard performance including the reference figure of merit value in foreign bodies detection state data packets
It is tested on the specific wireless electric power transmitter (or measuring device) of test and receiver certification to predefine, and can be with
It is arranged in wireless power receiver.For example, it may be determined that in charged area (for example, being arranged in wireless power transmitter or survey
Measure device on charging panel) in multiple specified locations correspond to wireless power receiver measurement figure of merit value in most
Small value is as with reference to figure of merit value.
When negotiation phase detects foreign matter, controller 1290 can be in response to foreign bodies detection state data packets to wireless
Power receiver sends nack signal.Therefore, charging end message can be sent to radio by wireless power receiver
Power transmitter.When receiving charging end message, wireless power transmitter can stop power transmission and return to selection rank
Section.
Controller 1290 can execute foreign bodies detection process after returning to the choice phase again, and determine whether
Through removing the foreign matter detected from charged area.When determining that foreign matter has been removed, controller 1290 can enter electric power and pass
It send the stage and executes the charging of wireless power reception device.
In addition, controller 1290 can monitor whether normally receive response signal in echo detection-phase (for example, letter
Number intensity data packet).For example, controller 1290 can monitor correspond to digital echo detection signal strength data packet whether by
It normally receives, and calculates the number that signal strength data Bao Wei is received normally, i.e., communication mistake counts.
In addition, controller 1290 can monitor whether normally receive identification and configuration data in identification and configuration phase
Packet.Specifically, controller 1180 can monitor whether identification and configuration data packet are received normally, and calculate and do not connect normally
The number of identification and configuration data packet is received, i.e. communication mistake counts.
For example, when not normally receiving identification in predetermined first time after normally receiving signal strength data packet
When data packet, controller 1290 can determine that identification and the reception of configuration data packet have failed.
In another example, make a reservation in the second time when after normally receiving signal strength data packet without successively
When receiving a series of identification data packets, controller 1290 can determine that identification and the reception of configuration data packet have failed.
Hereinafter, for ease of description, the data packet in echo detection-phase and/or identification and configuration phase is connect
The quantity for receiving failure is known as communication mistake counting.
For example, when foreign bodies detection reference frequency value is greater than present peak value frequency values and communication mistake counting is more than predetermined logical
When believing wrong reference value, controller 1290 can determine that there are foreign matters.
On the contrary, when foreign bodies detection reference frequency value is greater than present peak value frequency values but communication mistake counting equal to or less than pre-
When determining communication mistake reference value, controller 1290 can determine that there is no foreign matters.
Fig. 8 is the state transition diagram for showing the foreign bodies detection process according to the detection device for foreign matter of embodiment.
Referring to Fig. 8, when detecting object in the choice phase 1310, wireless power transmitter can be examined entering echo
Search has the frequency of maximum figure of merit value in available band before the survey stage, that is, present peak value frequency F_current_
Peak or resonance frequency.Information about the present peak value frequency searched can be stored in memory by detection device for foreign matter
In booking situation region.
When entering echo detection-phase 1320, detection device for foreign matter can send wireless power receiver for identification
Predetermined power signal, for example, digital echo detection.
When receiving the response signal of the electric power signal sent in echo detection-phase 1320 (for example, signal strength number
According to packet) when, wireless power transmitter can enter identification and configuration phase 1330 to identify wireless power receiver, and to institute
Various configuration parameters needed for the wireless power receiver setting wireless power transmission of identification.In addition, detection device for foreign matter can be with
Determine whether the wireless power receiver identified in identification and configuration phase 1330 can receive electric power.
When the identification of wireless power receiver and configuration normal termination, wireless power receiver can enter negotiation phase
1340 to execute foreign bodies detection process.
Foreign bodies detection process can be executed by following three steps.
In step 1, wireless power transmitter can receive at least one foreign matter from the wireless power receiver identified
Detecting state data packet.Here, foreign bodies detection state data packets may include about reference peak frequency values information or about
At least one of the information of the reference figure of merit value measured at reference crest frequency.
In step 2, wireless power transmitter can be determined with reference to peak frequency values for determining based on institute is received
With the presence or absence of the foreign bodies detection reference frequency of foreign matter.Here, other than reference peak frequency values, it is also contemplated that according to reception
The tolerance of the crest frequency variation of movement of the device in charged area determines foreign bodies detection reference frequency.For example, if holding
Difference is 5kHz, then can determine foreign bodies detection with reference to crest frequency by reference to the sum of crest frequency and 5kHz.
In step 3, present peak value frequency can be compared by wireless power transmitter with foreign bodies detection reference frequency,
To determine on wireless power transmission path with the presence or absence of foreign matter.It is different when present peak value frequency is greater than foreign bodies detection reference frequency
Analyte detection device can determine that there are foreign matters.On the contrary, when present peak value frequency is less than foreign bodies detection reference frequency, foreign bodies detection
Device can determine that there is no foreign matters.
When determining there are when foreign matter, wireless power transmitter can be received in response to FOD state data packets to wireless power
Device sends nack signal.Therefore, charging end message can be sent to wireless power transmitter by wireless power receiver.
When receiving charging end message, wireless power transmitter can stop power transmission and return to the choice phase 1310.This
When, the predetermined alert message that alarm unit output instruction has been detected by foreign matter can be used in wireless power transmitter.
In another example, when detecting foreign matter, instruction can be had detected that before entering the choice phase 1310
The predetermined alert message of foreign matter is sent to wireless power receiver.Then, wireless power receiver can be warned according to warning
Report message sends the message that request power transmission terminates to wireless power transmitter, for example, power transmission terminates data packet.
On the contrary, when determining there is no foreign matter, wireless power transmitter can enter power transmission stage 1350 and right
Wireless power receiver executes wireless charging.
Fig. 9 is the state transition diagram for showing the foreign bodies detection process according to the detection device for foreign matter of another embodiment.
Referring to Fig. 9, when detecting object in the choice phase 1410, detection device for foreign matter can be detected entering echo
Search has the frequency of maximum figure of merit value in available band before stage 1420, that is, present peak value frequency F_
current_peak。
When entering echo detection-phase 1420, detection device for foreign matter can send wireless power receiver for identification
Predetermined power signal, for example, digital echo detection.At this point, detection device for foreign matter can monitor response corresponding with electric power signal
The reception state of signal (for example, signal strength data packet), and collect communication mistake statistical data.
When not normally receiving response signal, detection device for foreign matter can repeat send electric power signal and collect about
The statistical data of the reception failure number of response signal.It is different when the reception failure number of response signal is more than predetermined reference value
Analyte detection device, which can enter the choice phase 1410 or terminate all power transmissions, reaches the predetermined time.
When normally receiving the response signal of the electric power signal sent in echo detection-phase 1420, foreign bodies detection dress
Identification and configuration phase 1430 can be entered to identify wireless power receiver and set to the wireless power receiver identified by setting
Set various configuration parameters needed for wireless power transmission.
In addition, detection device for foreign matter can determine that the wireless power receiver identified in identification and configuration phase 1430 is
It is no to receive electric power.
When not normally receiving identification and configuration data packet, detection device for foreign matter may return to the choice phase
1410.At this point, detection device for foreign matter can collect the statistical data of the reception failure number about identification and configuration data packet.
When the reception failure number of identification and configuration data packet is more than predetermined reference value, detection device for foreign matter can enter
Choice phase 1410 terminates all power transmissions up to the predetermined time.
When the reception failure number of response signal and/or identification and configuration data packet is more than predetermined reference value, electric power letter
Number (that is, sent in the choice phase 1410 include simulation echo detection electric power signal) transmission interrupt the predetermined time, from
And minimize unnecessary power wastage.If the number for interrupting electric power is more than predetermined reference value, detection device for foreign matter can
Removed predetermined alert is needed to export the object that instruction is located in charged area.
For example, detection device for foreign matter can manage the reception failure number of the response signal in echo detection-phase 1420
And the cumulative total of the reception failure number of the identification and configuration data packet in identification and configuration phase 1430 is as communication
Error count.
When the identification of wireless power receiver and configuration normal termination, detection device for foreign matter can enter negotiation phase
1440 to execute foreign bodies detection process.
Foreign bodies detection process can be executed by following four step.
In step 1, detection device for foreign matter can receive the inspection of at least one foreign matter from the wireless power receiver identified
Survey state data packets.Here, foreign bodies detection state data packets may include about the information of reference crest frequency and about joining
Examine at least one of the information of the reference figure of merit value measured at crest frequency.
In step 2, detection device for foreign matter can be used to determine whether based on institute is received with reference to peak frequency values determination
There are the foreign bodies detection reference frequencies of foreign matter.Here, other than reference peak frequency values, it is also contemplated that existed according to receiver
The tolerance of the crest frequency variation of movement in charged area determines foreign bodies detection reference frequency.For example, if tolerance
It is 5kHz, then can determines foreign bodies detection with reference to crest frequency by reference to the sum of crest frequency and 5kHz.
In step 3, detection device for foreign matter can compare present peak value frequency values and foreign bodies detection reference frequency value
Compared with.
In step 4, when foreign bodies detection reference frequency value is greater than present peak value frequency values as comparative result, foreign matter inspection
Whether survey device and can determine that communication mistake counts is more than predetermined communication mistake reference value.
When determining that communication mistake is counted more than predetermined communication mistake reference value, detection device for foreign matter can be determined wireless
There are foreign matters on power transmission path.When determining there are when foreign matter, detection device for foreign matter can terminate wireless charging and return to
Choice phase 1410.At this point, the output instruction of internal alarm device, which can be used, in detection device for foreign matter has detected that the predetermined of foreign matter
Alert message.In another example, when detecting foreign matter, detection device for foreign matter can enter the choice phase 1410 it
It is preceding that instruction is had detected that the predetermined alert message of foreign matter is sent to wireless power receiver.Then, wireless power receives
Device can send the message that request power transmission terminates to wireless power transmitter according to alert message, for example, electric power passes
Send end data packet.
On the contrary, when determining that detection device for foreign matter can enter the power transmission stage 1450 to wireless there is no when foreign matter
Power receiver executes wireless charging.
Figure 10 is the view for showing the structure of FOD state data packets message according to one embodiment.
0, FOD state data packets message 1500 can have the length of 2 bytes referring to Fig.1, and including having 6 bits
1501 field of the first data of length, 1502 field of mode with 2 bit lengths and the with 1 byte length second (ginseng
Examine figure of merit value) 1503.
For example, in foreign bodies detection state data packets message 1500, as shown in appended drawing reference 1504, if 1502 word of mode
Section is configured to " 00 ", then 0 record of all bits of 1501 field of the first data, and can will receive in wireless power
Measurement information corresponding with the reference figure of merit value determined is recorded in 1503 field of the second data in the state of device power-off.
If 1502 field of mode is arranged to binary value " 01 ", all bits of 1501 field of the first data can be with
It is recorded, and information corresponding with reference peak frequency values can be recorded in 1503 field of reference value with 0.
Here, with reference to peak frequency values can indicate in the state that only wireless power receiver is located in charged area
There is the frequency of maximum figure of merit value in available band.In addition, with reference to peak frequency values being connect for wireless power specifying
Receive the value for measuring and determining on the specified particular measurement device (or specific wireless electric power transmitter) of the certification of device.
In another example, in foreign bodies detection state data packets message 1500, as shown in appended drawing reference 1505, if mould
1502 field of formula is arranged to " 00 ", then information corresponding with reference peak frequency values can be recorded in 1501 word of the first data
Duan Zhong, and can be corresponding by the reference figure of merit value for measuring and determining in the state that wireless power receiver powers off
Information is recorded in 1503 field of the second data.
The first data can be recorded in determine based on the size of the size of data field and available (or work) frequency band
The offset (or resolution ratio) of reference peak frequency values in 1501 fields.
For example, since the size of the first data 1503 is 6 bits, so offset can have the value from 0 to 63.If work
Working frequency bandwidth is 128kHz, then can obtain the resolution ratio with reference to peak frequency values in the following manner: by usable frequency band
The wide quantity divided by the first data 1501, i.e. 128kHz/64=2kHz.
Figure 11 is the flow chart of the foreign matter detecting method in the wireless power transmission device shown according to embodiment.
Referring to Fig.1 1, wireless power transmission device can detect the object being located in charged area in the choice phase
(S1610).When an object is detected, wireless power transmission device search present peak value frequency before entering echo detection-phase
Rate, present peak value frequency are with the maximum quality factor in the figure of merit value measured at multiple frequencies in available band
The frequency of value, and present peak value frequency is stored in booking situation region (S1620).Here it is possible to by scheduled frequency
Offset determines the quantity of the frequency for measuring the figure of merit value for searching for present peak value frequency in available band.It should infuse
Meaning can differently determine frequency shift (FS) according to the design of those skilled in the art.In addition, available band can be according to being applied to
The standard of wireless charging system and change.
In another embodiment, wireless power transmission device can detecte with maximum coil voltage (or resonant capacitance
The maximum voltage at device both ends) present peak value frequency and store it in preset frequency region (S1620).Wireless power transmission
Device controls working frequency to sense (frequency scanning) coil voltage (or the voltage at resonant capacitor both ends).For example, radio
Power transmission apparatus can while by working frequency from low-frequency sweep to high frequency measuring coil voltage (or resonant capacitor both ends
Voltage).Then in scan frequency, coil voltage (or the voltage at resonant capacitor both ends), which is gradually increased, reduces.At this point, working as
When sensing the voltage of reduction, working frequency at this time can be determined as resonance frequency and (work as leading peak by wireless power transmission device
It is worth frequency).
When receiving the foreign bodies detection state data packets including reference peak frequency values in negotiation phase, wireless power
Transmitting device can determine foreign bodies detection reference frequency (S1630) based on reference to peak frequency values.
Wireless power transmission device can determine whether present peak value frequency values are more than foreign bodies detection reference frequency value
(S1640)。
When determining that present peak value frequency values are more than foreign bodies detection reference frequency value, wireless power transmission device can be determined
Detect foreign matter (S1650).
When determining that present peak value frequency values are less than foreign bodies detection reference frequency value, wireless power transmission device can be determined
Foreign matter (S1660) is not detected.
Figure 12 is the flow chart of the foreign matter detecting method in the wireless power transmission device shown according to another embodiment.
Referring to Fig.1 2, wireless power transmission device can detect the object being located in charged area in the choice phase
(S1710).When an object is detected, wireless power transmission device can temporarily cease electric power before entering echo detection-phase
Transmission, searches for present peak value frequency, which is with the quality measured at multiple frequencies in available band
The frequency of maximum figure of merit value in factor value, and present peak value frequency is stored in booking situation region (S1720).
Here it is possible to by scheduled frequency shift (FS) determine for measure in available band search present peak value frequency quality because
The quantity of the frequency of numerical value.It should be noted that can differently determine frequency shift (FS) according to the design of those skilled in the art.In addition,
Available band can change according to the standard for being applied to wireless charging system.
When searching for present peak value frequency, wireless power transmission device can collect the statistical data of communication mistake counting
(S1730).Here it is possible to the collection of statistical data in echo detection-phase or at least one of identification and configuration phase.
For example, wireless power transmission device can send digital echo detection, to identify receiver in echo detection-phase.
Wireless power transmission device, which can be monitored, detects corresponding response signal as with the digital echo in echo detection-phase
Whether signal strength data packet is received normally, and calculates the first communication mistake corresponding with echo detection-phase and count.
In another example, when echo detection-phase normally receives signal strength data packet, wireless power transmission
Device can enter identification and configuration phase and monitor the reception state of identification data packet and configuration data packet.At this point, radio
Power transmission apparatus can be calculated to be counted with the second communication mistake corresponding with configuration phase is identified.
Certainly, wireless power transmission device can be calculated counts and the counting of the second communication mistake as the first communication mistake
The third communication error count of sum.
When receiving the foreign bodies detection state data packets including reference peak frequency values in negotiation phase, wireless power is passed
Defeated device can determine foreign bodies detection reference frequency (S1740) based on reference to peak frequency values.
Wireless power transmission device can check whether present peak value frequency values are more than foreign bodies detection reference frequency value
(S1750)。
When determining that present peak value frequency values are more than foreign bodies detection reference frequency value, wireless power transmission device can be checked
Whether it is more than predetermined communication mistake reference value (S1760) that communication mistake counts.Here, communication mistake counting can be the first communication
Any one of error count and the counting of the second communication mistake.
When determining that communication mistake is counted more than predetermined communication mistake reference value in step 1760, wireless power transmission dress
Foreign matter (S1770) can be confirmly detected by setting.
When determining that communication mistake is counted less than predetermined communication mistake reference value, wireless power transmission device can be determined not
Detect foreign matter (S1780).
Certainly, when determining that present peak value frequency values are less than or equal to foreign bodies detection reference frequency value in step 1750,
Wireless power transmission device, which can determine, is not detected foreign matter.
Therefore, in the present embodiment, due to being based on the ginseng being stored in wireless power receiver with the presence or absence of foreign matter
It examines crest frequency and difference between the present peak value frequency measured in wireless power transmitter to determine, therefore can be more quasi-
Really detect foreign matter.
Figure 13 is the figure of merit value and peak according to the placement of foreign matter in wireless charging system shown according to embodiment
It is worth the experimental result curve graph of the variation of frequency.
Referring to Fig.1 3, when the first receiver and foreign matter are located in charged area, crest frequency is than only the first receiver position
The big △ f of the crest frequency of situation in charged area.Hereinafter, for ease of description, △ f is referred to as peak (frequency) deviation
Value.Relatively, it can be seen that work as being located at the corresponding crest frequency of the state in charged area with the first receiver and foreign matter
The figure of merit value measured under previous peaks frequency in crest frequency corresponding with the state that only the first receiver is placed than joining
Examine the small △ Q of the figure of merit value measured under crest frequency.Hereinafter, for ease of description, △ Q is referred to as quality factor offset
Value.
As shown in figure 13, the experimental result with the first receiver is obtained for remaining second receiver to the 4th receiver
Similar result.
It can be based on peak (frequency) deviation value and quality factor deviant to ginseng according to the detection device for foreign matter of embodiment
Measurement quality factor value is examined to be calibrated.For example, with peak (frequency) deviation value and quality factor deviant and increase, reference
The calibration ratio of figure of merit value also will increase.
In general, resonance occurs under the crest frequency with maximum figure of merit value in the case where wireless charging system
Phenomenon, and electrical efficiency maximizes.
Figure 14 is the peak for showing the crest frequency according to every kind of receiver types of embodiment and the placement according to foreign matter
It is worth the experimental result table of the variation of frequency.
Referring to Fig.1 4, it can be seen that the peak value obtained in the state that only wireless power receiver is located in charged area
Frequency 1910 and the figure of merit value 1920 measured under crest frequency can have different values according to the type of receiver.
Particularly, reference numbers 1910 and 1930, it can be seen that when not being only wireless power receiver and foreign matter
Crest frequency 1903 when also being located in charged area is greater than the crest frequency 1910 when only wireless power receiver is placed.
In addition, reference numbers 1920 and 1940, it can be seen that surveyed when receiver and foreign matter are located in charged area
The figure of merit value of amount is less than figure of merit value frequency when only emplacing receiver.
In addition, reference numbers 1950, the position with the foreign matter being located in charged area becomes further from center, peak
Being worth frequency reduces still figure of merit value increase.
Figure 15 is the experiment for showing the variation of the figure of merit value and crest frequency according to the movement of wireless power receiver
As a result table.
Referring to Fig.1 5, more than wireless power receiver/down/left/right direction moved with the interval of 5mm from the center of charging bed
When dynamic, first to the crest frequency of each of third receiver and the variation of figure of merit value is shown.As shown in figure 16,
As can be seen that the maximum variation of the crest frequency of the movement according to receiver on charging bed is less than 5kHz.
Figure 16 be show according to the type of wireless power transmitter and foreign matter in the presence/absence of crest frequency variation
Experimental result.
As shown in figure 16, which is characterized in that according to wireless power transmitter corresponding with each wireless power receiver
Type crest frequency variation be relatively shorter than according to foreign matter in specific wireless electric power transmitter in the presence/absence of peak
It is worth the variation of frequency.
In the present embodiment, it is based on features described above, when an object is detected, wireless power transmitter can measure available
Figure of merit value and search peak frequency in frequency band.At this point, wireless power transmitter can by the crest frequency searched with
Whether the foreign bodies detection reference frequency determined based on reference crest frequency is compared, and identify crest frequency due to different
Difference between object or wireless power sender type and change.
Therefore, in the present embodiment, due to based on the reference crest frequency that is stored in wireless power receiver with
Difference in wireless power transmitter between the present peak value frequency of actual measurement come determine foreign matter in the presence/absence of therefore, can
More accurately to detect foreign matter.
Wireless power transmitter according to the present embodiment can be based on the reference peak value obtained from wireless power receiver
Frequency values determine the foreign bodies detection reference frequency being used to determine whether there are foreign matter.
Such as, it may be considered that reference peak value frequency values and tolerance corresponding with crest frequency variation, according to wireless power
Difference between the type of transmitter determines foreign bodies detection reference frequency.For example, if according to the class of wireless power transmitter
The peak-peak frequency variation of difference between type is 5kHz, then can set foreign bodies detection reference frequency to reference to peak value frequency
The sum of rate value and 5kHz.
In another example, wireless power transmitter according to the present embodiment can be determined according to receiver in charging zone
The peak-peak frequency variation of movement in domain and the peak-peak frequency according to the difference between wireless power sender type
The larger value in variation is as tolerance.At this point it is possible to by foreign bodies detection reference frequency be set as with reference to peak frequency values and really
The sum of fixed tolerance.
It can be implemented as can be written into computer readable recording medium according to the method for aforementioned embodiments and therefore may be used
With the code read by computer.The example of computer readable recording medium includes ROM, RAM, CD-ROM, tape, floppy disk, light
Learn data storage device and carrier wave (for example, the data by internet are transmitted).
Computer readable recording medium can be distributed in the multiple computer systems for being connected to network, so that computer can
Code is read to be written into wherein and in decentralized manner from its execution.It will be understood by those skilled in the art that realizing real herein
Function program needed for applying mode, code and code segment.
It will be appreciated by those skilled in the art that the spirit and essential characteristics for not departing from present disclosure the case where
Under, present disclosure can be implemented with other ad hoc fashions other than manner described herein.
Therefore, foregoing exemplary embodiment is all regarded in an illustrative rather than restrictive sense in all respects.This hair
Bright range should be determined by appended claims and its legal equivalents, rather than be determined by above description, and be fallen into appended
All changes in the meaning and equivalency range of claim, which are intended to, to be included in.
[industrial applicibility]
Embodiment is suitable for wireless charging device, and is especially suited for use the foreign matter that detection is located in charged area
Detection device for foreign matter and wireless power transmission device with foreign bodies detection function.
Claims (10)
1. a kind of foreign matter detecting method of wireless power transmitter, the foreign matter detecting method include:
Detection is located at the object in charged area to measure the crest frequency with maximum figure of merit value；
Receive from wireless power receiver includes the foreign bodies detection state data packets for referring to crest frequency；
Based on the frequency determined with reference to crest frequency for detecting foreign matter；And
The crest frequency is compared with identified frequency to determine whether there is foreign matter.
2. foreign matter detecting method according to claim 1, wherein determine that the frequency for detecting foreign matter includes by described
The frequency for detecting foreign matter is determined with reference to the sum of crest frequency and tolerance.
3. foreign matter detecting method according to claim 1, wherein when the crest frequency is greater than the frequency for detecting foreign matter
When rate, determine that there are foreign matters.
4. foreign matter detecting method according to claim 1, wherein the wireless power transmitter connects in the wireless power
It receives before device receives echo detection signal and measures the crest frequency.
5. foreign matter detecting method according to claim 1, wherein the reference crest frequency has to be connect in only wireless power
Receive the maximum figure of merit value in the state that device is located in the charged area in available band.
6. foreign matter detecting method according to claim 1, wherein the foreign bodies detection state data packets further include mode letter
Breath, and the wireless power transmitter includes in the foreign bodies detection state data packets based on pattern information identification
It is described to refer to crest frequency.
7. a kind of for detecting the detection device for foreign matter for the foreign matter being located in charged area, the detection device for foreign matter includes:
Coil unit comprising inductor and resonant capacitor, and the coil unit is configured to convert electrical current into magnetic
Force flux；
Inverter is configured to receive direct current DC electric power and converts thereof into exchange AC electric power and be sent to the AC electric power
The coil unit；And
Controller is configured to control the frequency of the AC electric power exported from the inverter and the electricity using the coil unit
Pressure or electric current demodulate signal,
Wherein, the controller is configured to:
Detection is located at the object in the charged area to measure the crest frequency with maximum figure of merit value,
Receiving from wireless power receiver includes the foreign bodies detection state data packets for referring to crest frequency,
Based on the frequency determined with reference to crest frequency for detecting foreign matter, and
The crest frequency is compared with identified frequency to determine whether there is foreign matter.
8. detection device for foreign matter according to claim 7, wherein the controller refers to crest frequency and appearance by described
The sum of difference determines the frequency for detecting foreign matter.
9. detection device for foreign matter according to claim 7, wherein the controller is received in the wireless power receiver
The crest frequency is measured before to echo detection signal.
10. detection device for foreign matter according to claim 7, wherein described to correspond to reference to crest frequency in the only nothing
Maximum figure of merit value in available band in the state that line power receiver is located in the charged area.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020160166866A KR102605047B1 (en) | 2016-12-08 | 2016-12-08 | Method and Apparatus for Foreign Object Detection in Wireless Charging |
| KR10-2016-0166866 | 2016-12-08 | ||
| PCT/KR2017/014417 WO2018106072A1 (en) | 2016-12-08 | 2017-12-08 | Foreign substance detection method for wireless charging and apparatus therefor |
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| CN110168859A true CN110168859A (en) | 2019-08-23 |
| CN110168859B CN110168859B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780082535.XA Active CN110168859B (en) | 2016-12-08 | 2017-12-08 | Foreign matter detection method and device for wireless charging |
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| US (3) | US11056924B2 (en) |
| EP (2) | EP3553916B1 (en) |
| JP (1) | JP7252123B2 (en) |
| KR (1) | KR102605047B1 (en) |
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| WO (1) | WO2018106072A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021259048A1 (en) * | 2020-06-24 | 2021-12-30 | 深圳市力博得科技有限公司 | Wireless charging method, foreign matter detection method and apparatus, and base and storage medium |
| WO2022110884A1 (en) * | 2020-11-25 | 2022-06-02 | 华为数字能源技术有限公司 | Wireless charging device, charging base and foreign object detection method |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114786289A (en) * | 2015-04-17 | 2022-07-22 | 豪倍照明公司 | Emergency light-emitting unit and control method thereof |
| US10199881B2 (en) | 2015-10-23 | 2019-02-05 | Mediatek Inc. | Robust foreign objects detection |
| KR102605047B1 (en) * | 2016-12-08 | 2023-11-24 | 엘지이노텍 주식회사 | Method and Apparatus for Foreign Object Detection in Wireless Charging |
| WO2019054142A1 (en) * | 2017-09-14 | 2019-03-21 | シャープ株式会社 | Wireless power transmission apparatus |
| US11005304B2 (en) | 2018-06-24 | 2021-05-11 | Chargedge, Inc. | Foreign object and valid receiver detection techniques in wireless power transfer |
| TWI738029B (en) | 2018-07-19 | 2021-09-01 | 新加坡商聯發科技（新加坡）私人有限公司 | Detecting foreign objects in wireless power transfer systems |
| US11437864B2 (en) * | 2018-08-14 | 2022-09-06 | Lg Electronics Inc. | Apparatus and method for detecting foreign object in wireless power transmission system |
| KR102554226B1 (en) * | 2018-09-04 | 2023-07-10 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Apparatus and method for transmitting power wirelessly |
| KR102532469B1 (en) | 2018-11-19 | 2023-05-12 | 엘지전자 주식회사 | Wireless power transfer appratus |
| KR20210089529A (en) | 2020-01-08 | 2021-07-16 | 삼성전자주식회사 | Wireless charging method and system for detecting invalid materials during wireless charging |
| CN113452161B (en) * | 2021-07-02 | 2023-09-29 | 阳光电源股份有限公司 | Wireless charging device, metal foreign matter detection method thereof and wireless charging system |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5071574B1 (en) * | 2011-07-05 | 2012-11-14 | ソニー株式会社 | Sensing device, power receiving device, non-contact power transmission system, and sensing method |
| CN103176217A (en) * | 2011-12-26 | 2013-06-26 | 索尼公司 | Detecting device, detecting system, power transmitting device, noncontact power transmission system, and detecting method |
| CN103176215A (en) * | 2011-12-21 | 2013-06-26 | 索尼公司 | Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method |
| CN103308949A (en) * | 2012-03-14 | 2013-09-18 | 索尼公司 | Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system |
| US20130241302A1 (en) * | 2012-03-14 | 2013-09-19 | Sony Corporation | Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system |
| TW201417439A (en) * | 2011-08-25 | 2014-05-01 | Panasonic Corp | Method for detecting metal foreign object in contactless power supply system, contactless power supply device, power reception device, and contactless power supply system |
| WO2014203346A1 (en) * | 2013-06-19 | 2014-12-24 | ルネサスエレクトロニクス株式会社 | Power transmission device, wireless power feeding system, and control method |
| CN104253492A (en) * | 2013-06-28 | 2014-12-31 | 罗伯特·博世有限公司 | Method for detecting foreign objects in an induction charging device |
| JP2015046990A (en) * | 2013-08-28 | 2015-03-12 | ソニー株式会社 | Power feeding apparatus, power reception apparatus, power feeding system, and control method for power feeding apparatus |
| EP2937719A1 (en) * | 2014-04-24 | 2015-10-28 | Panasonic Corporation | Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system |
| DE202014010660U1 (en) * | 2014-09-18 | 2016-03-22 | Continental Automotive Gmbh | Wireless battery charging system for a device with rechargeable battery and with foreign body detection |
| CN106160269A (en) * | 2015-05-15 | 2016-11-23 | 松下知识产权经营株式会社 | Detection device for foreign matter, wireless power transmission device and wireless power transmission system |
Family Cites Families (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010183705A (en) * | 2009-02-04 | 2010-08-19 | Seiko Epson Corp | Method of testing power transmission apparatus or power receiving apparatus, power transmission apparatus, power receiving apparatus and non-contact power transmission system |
| CN105048643B (en) * | 2010-02-08 | 2018-08-03 | 飞利浦知识产权企业有限公司 | input parasitic metal detection |
| JP2012016125A (en) | 2010-06-30 | 2012-01-19 | Panasonic Electric Works Co Ltd | Non-contact power supply system, and metal foreign substance detector of non-contact power supply system |
| JP4996722B2 (en) * | 2010-06-30 | 2012-08-08 | 株式会社東芝 | Power transmission system and power transmission device |
| JP2012244732A (en) | 2011-05-18 | 2012-12-10 | Sony Corp | Electromagnetic coupling state detection circuit, transmission equipment, non-contact power transmission system, and method for detecting electromagnetic coupling state |
| JP2013059236A (en) | 2011-09-09 | 2013-03-28 | Sony Corp | Detection device, power reception device, power transmission device, non-contact power transmission system, and detection method |
| JP5915904B2 (en) * | 2012-06-22 | 2016-05-11 | ソニー株式会社 | Processing apparatus, processing method, and program |
| KR101912692B1 (en) * | 2012-07-06 | 2018-10-29 | 엘지전자 주식회사 | Method and apparatus for periodically changing frequency in wireless power transfer |
| US9178361B2 (en) * | 2012-09-27 | 2015-11-03 | ConvenientPower, Ltd. | Methods and systems for detecting foreign objects in a wireless charging system |
| KR102049118B1 (en) | 2013-02-20 | 2020-01-08 | 지이 하이브리드 테크놀로지스, 엘엘씨 | Apparatus and method for detecting foreign object in wireless power transmitting system |
| KR102051682B1 (en) * | 2013-03-15 | 2019-12-03 | 지이 하이브리드 테크놀로지스, 엘엘씨 | Apparatus and method for detecting foreign object in wireless power transmitting system |
| JP2014187795A (en) * | 2013-03-22 | 2014-10-02 | Dexerials Corp | Transmission apparatus, transmission and reception apparatus, reception apparatus detection method, reception apparatus detection program, and semiconductor device |
| US9882437B2 (en) * | 2013-08-28 | 2018-01-30 | Sony Corporation | Power feeding apparatus, power receiving apparatus, power feeding system, and method of controlling power feeding |
| US10097041B2 (en) | 2013-10-31 | 2018-10-09 | Lg Electronics Inc. | Wireless power transmission device and control method therefor |
| KR101667725B1 (en) | 2013-11-21 | 2016-10-20 | 엘지전자 주식회사 | Wireless power transmitter and method for controlling the same |
| KR101750870B1 (en) * | 2014-06-20 | 2017-06-26 | 엘지전자 주식회사 | Wireless power transfer method, apparatus and system |
| WO2016006441A1 (en) * | 2014-07-09 | 2016-01-14 | ソニー株式会社 | Power receiver, power feeder, and electronic device |
| JP6410641B2 (en) * | 2015-03-04 | 2018-10-24 | ローム株式会社 | Wireless power transmission device, foreign object detection method, charger |
| US10199881B2 (en) * | 2015-10-23 | 2019-02-05 | Mediatek Inc. | Robust foreign objects detection |
| CN115603473A (en) * | 2016-07-01 | 2023-01-13 | Lg伊诺特有限公司（Kr） | Method of communicating with wireless power transmitter and wireless power receiver |
| WO2018020890A1 (en) * | 2016-07-29 | 2018-02-01 | ソニーセミコンダクタソリューションズ株式会社 | Power-supplying system |
| CN109478799B (en) * | 2016-07-29 | 2023-08-01 | 索尼半导体解决方案公司 | Feeding device |
| CN107994685B (en) * | 2016-10-26 | 2023-11-24 | 恩智浦美国有限公司 | Foreign object detection |
| KR102605047B1 (en) * | 2016-12-08 | 2023-11-24 | 엘지이노텍 주식회사 | Method and Apparatus for Foreign Object Detection in Wireless Charging |
| US10615655B2 (en) | 2017-02-23 | 2020-04-07 | Borgwarner Inc. | Electric machine with stator having a plurality of lead wires extending from a common winding layer |
| KR102509314B1 (en) * | 2018-05-16 | 2023-03-14 | 엘지이노텍 주식회사 | Method and Apparatus for Controlling Wireless Power Transmission |
| US11355281B2 (en) * | 2018-06-28 | 2022-06-07 | Lg Electronics Inc. | Wireless power reception apparatus and method therefor |
| US11355971B2 (en) * | 2018-10-23 | 2022-06-07 | Lg Electronics Inc. | Method and device for transmitting data in wireless power transmission system |
-
2016
- 2016-12-08 KR KR1020160166866A patent/KR102605047B1/en active IP Right Grant
-
2017
- 2017-12-08 WO PCT/KR2017/014417 patent/WO2018106072A1/en unknown
- 2017-12-08 CN CN201780082535.XA patent/CN110168859B/en active Active
- 2017-12-08 EP EP17879289.1A patent/EP3553916B1/en active Active
- 2017-12-08 EP EP22216452.7A patent/EP4178076A1/en active Pending
- 2017-12-08 JP JP2019530807A patent/JP7252123B2/en active Active
- 2017-12-08 US US16/467,865 patent/US11056924B2/en active Active
-
2021
- 2021-06-07 US US17/340,666 patent/US11632002B2/en active Active
-
2023
- 2023-03-09 US US18/119,562 patent/US11936209B2/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5071574B1 (en) * | 2011-07-05 | 2012-11-14 | ソニー株式会社 | Sensing device, power receiving device, non-contact power transmission system, and sensing method |
| TW201417439A (en) * | 2011-08-25 | 2014-05-01 | Panasonic Corp | Method for detecting metal foreign object in contactless power supply system, contactless power supply device, power reception device, and contactless power supply system |
| CN103176215A (en) * | 2011-12-21 | 2013-06-26 | 索尼公司 | Detection apparatus, power receiving apparatus, non-contact power transmission system and detection method |
| CN103176217A (en) * | 2011-12-26 | 2013-06-26 | 索尼公司 | Detecting device, detecting system, power transmitting device, noncontact power transmission system, and detecting method |
| CN103308949A (en) * | 2012-03-14 | 2013-09-18 | 索尼公司 | Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system |
| US20130241300A1 (en) * | 2012-03-14 | 2013-09-19 | Sony Corporation | Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system |
| US20130241302A1 (en) * | 2012-03-14 | 2013-09-19 | Sony Corporation | Detecting apparatus, power receiving apparatus, power transmitting apparatus, and contactless power supply system |
| WO2014203346A1 (en) * | 2013-06-19 | 2014-12-24 | ルネサスエレクトロニクス株式会社 | Power transmission device, wireless power feeding system, and control method |
| CN104253492A (en) * | 2013-06-28 | 2014-12-31 | 罗伯特·博世有限公司 | Method for detecting foreign objects in an induction charging device |
| JP2015046990A (en) * | 2013-08-28 | 2015-03-12 | ソニー株式会社 | Power feeding apparatus, power reception apparatus, power feeding system, and control method for power feeding apparatus |
| EP2937719A1 (en) * | 2014-04-24 | 2015-10-28 | Panasonic Corporation | Foreign-object detecting device, wireless electric-power transmitting device, and wireless electric-power transmission system |
| DE202014010660U1 (en) * | 2014-09-18 | 2016-03-22 | Continental Automotive Gmbh | Wireless battery charging system for a device with rechargeable battery and with foreign body detection |
| CN106160269A (en) * | 2015-05-15 | 2016-11-23 | 松下知识产权经营株式会社 | Detection device for foreign matter, wireless power transmission device and wireless power transmission system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021259048A1 (en) * | 2020-06-24 | 2021-12-30 | 深圳市力博得科技有限公司 | Wireless charging method, foreign matter detection method and apparatus, and base and storage medium |
| WO2022110884A1 (en) * | 2020-11-25 | 2022-06-02 | 华为数字能源技术有限公司 | Wireless charging device, charging base and foreign object detection method |
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| EP3553916B1 (en) | 2023-02-08 |
| EP4178076A1 (en) | 2023-05-10 |
| EP3553916A4 (en) | 2020-08-05 |
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| US20210296938A1 (en) | 2021-09-23 |
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| US11936209B2 (en) | 2024-03-19 |
| JP7252123B2 (en) | 2023-04-04 |
| KR20180065693A (en) | 2018-06-18 |
| US20190312468A1 (en) | 2019-10-10 |
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